The Humminbird 998c SI Combo features a brilliant color, wide-screen 480V x 800H 8-Inch display, 83/200KHZ dual beam sonar with 1000 Watts of transmit power, in addition to a 455KHz Side Imaging sonar. The unit has GPS chartplotting with external antenna and advanced Fishing System capabilities. Rugged construction and ease of use make Humminbird fishfinders a favorite of anglers worldwide. The built-in Contour XD chart covers the contiguous U.S.A. coastline and inland lakes and rivers. On the coast, this clearly shows features as small as canals, and many coastal navigation lights. Inland, the Contour XD features virtually all recreational lakes and rivers, plus hundreds of thousands of small lakes that don’t appear on other charts. In other words, your lake is likely to be there! Internal memory has a capacity of 2,750 waypoints, 45 routes, and 50 tracks of 20,000 points each. Optional network modules include an external GPS antenna, WeatherSense barometer, wireless sonar link, Cannon Link for control of downrigger, Interlink for multiple units, and radar. Sonar features include Freeze Frame, instant image update, real time sonar window, selective Fish ID, echo enhancement, screen snapshot to SD card, split screen zoom, True Arch technology, and wide/narrow cone split screen. The user-friendly technology includes custom digital readouts, large digit view, quick disconnect mounting, triplog, and X-press menu system. Included in the package are two transom mount transducers, installation hardware, and owner-Feets manual. Dimensions: 11-Inch W x 6-Inch H x 4-Inch D. One year parts and labor warranty. GPS input required.